CMS means Content Management System and e-commerce means Electronic commerce. CMS used to build and develop dynamic web pages in websites. E-commerce is a one type of website used to selling and buying products online. The examples of CMS are Wordpress, Drupal, Joomla etc. The examples of shopping carts are OSCommerce, Magneto etc.
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A content management system handles building dynamic webpages for a website. A e-commerce website is a shopping cart designed to sell items online.